added ability to load image as legend
modified layer groups and added example
updated example
Merge remote-tracking branch 'tombatossals/master' into staticImageLegend
rebuilt
updated example
Revert "modified layer groups and added example"

This reverts commit ef4bf043630fa362485eabae9d7840a6be48de7b.
add layer groups
update conditional
added example for layer groups
Undefine some object on the map destruction to avoid memory leaks. Thanks to @aburtsev for the solution in this issue:
https://github.com/tombatossals/angular-leaflet-directive/issues/573
Fix jslint
Merge pull request #571 from eczajk1/add_support_for_layer_groups

modified layer groups and added example
Merge pull request #572 from ForeverOceans/staticImageLegend

Static image legend
Merge pull request #575 from trailbehind/lint

Fix jslint
Merge remote-tracking branch 'upstream/master'